Not sure on the ssl one. The java.lang.NullPointerException: Inflater has been closed problem I've seen too. Could not pinpoint a cause yet. Googling reveals other Java projects have experienced this ...

After upgrading to Java 12: Error: Error running instance method java.lang.NullPointerException at java.base/jdk.internal.reflect.Reflection.verifyMemberAccess ...

Java VM Version: Java HotSpot (TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 920088352 bytes (877 MB) / 1073741824 bytes (1024 MB) up to 2147483648 bytes (2048 MB) ...

ERROR: NullPointerException encountered while trying to adding String to Deque that is set to null. java.lang.NullPointerException INFO: Successful at adding String to Deque that is set to null ...